Liner block for cement sewer pipes



.R. M. DALLAM LLNER BLOCK FOR CMENT SEWER PIPES Filed June 28, 1926 Patented Sept. 4,- 1928.

UNITED sTATEs PATENT oserei-2,..

l LINER BLOCK FOR CEMENT SEWER PIPS.

Application led June 28, 1926. Seal No.'119,187.

' l0 among which is hydrogen sulphide gas.

` This invention relates to improvements in liner blocks formed of vitried clay to be used in concrete sewer pipes.

Considerable difficulty has been experienoed in retaining the liner blocks withinthe concrete sewer pipes after the same have been installed for a considerable length of time, due to the fact that certain gases are formed by the decomposition of the sewa e," 1s gas is easily decomposed in sulphuricacid which attacks the concrete and decomposes the' same, causing the liners to become loosened, which later fall into the bottom of the pipe, leaving the inner surface of the concrete pipe exposed to the action of the gases, the hydrogen sulphide gas entering between the imperfect joints of the blocks, as it 1sA almost impossible to form all the joints abso- 1 lutely gas tight. l

It is, therefore, the object of my inventlon to provide liner blocks of vitried clay having"'oints so constructed that alarga percent of t e leakage ofthe destructive gases will be prevented, and further constructed in such a manner that even if one or'more blocks in a givenv area should become loosened, they will not fall out of place, but will v.be locked in such a manner as to be 'retained therein.

A further object is to provide liner lblocks of vitrified clay in the form of hollow building blocks', which may be readily constructed on a tile machine, and which may bereadily broken-into a number of slabs of proper d1- mensionsand shapes after theY tile has been burned.' f

' -`My invention consists in the construction, arrangement and combination of the various 'parts of the device, whereb the objects contemplated are attained, as ereinafter more fully'set forth, pointed out in my claims, and illlustiilated in the accompanying drawings, in wuc v u Figure 1 is a perspective view of my iml proved block before it is broken into slabs.

Figure 2 is aperspective view of the inside of one of the slabs.

Figure 3 is a perspective view of the out side of one of the liner slabs.

body portion 10.

Figure 4 is a transversesectional view of a'sewer pipe showing the 'manner in which my* improved liner 1s applied', one'p'ortion of the section being cut'l near the flange of the liner and the other portion being cut'near the central portion of the liner.

Figure 5 is an enlarged, detail, sectional view taken on the line 5-5 of Figure t 'Figure' 6 is an enlarged, detail, sectional view taken on the line 6-6 of Figure 4.

Figure n7 is a sectional view taken on the line 7-77 of Fi ure 5.

My improve liner comprises a body portion 10 substantially in the form of a rectangular slab and slightly curved longitudinally and has its inner face smooth, and thev central' portion of its back or outer face rovided with a series of-longitudinally exten ing ribs 11. The edges of said ribs are'beveled inf wardly to provide means whereby the tile will be anchored in the concrete.

One-endof the body portion 10 is provided with a flange 12 of larger diameter than the The inner face of said ange 12 is provided with a series of longitudinally extending `ribs 1B, said ribsbeing spaced apart and having their inner surfaces' beveled inwardl to form doveta'il grooves' 14 'Ill between said ri s. 'The -said grooves 14 are' designed to receive the ends of the ribs 11 when the end of one slab is placed adjacent to the other. It will be seen that the oppo-A site .ends of the ribs 11 terminate in the ange 12, 131i the mannervclearly illustrated in Figure It will be seen by referring to Figures 3 and 7 that one edge o'f the 'back of the body portion 10 is provided with a rib ,15 similar to the ribs y11, with the exce tion that'the edgeof said rib and the edge o the body portion is provided with a rabbet 16. That portion of the rabbet forming theedge of the b ody ortonis slightly beveled. The op osite e ge of the body' portion 10 is also bev ed at 17 to coact with the beveled e'd e ofthe rabbet 16 when two slabs `arelai edge to edge; This leaves a portion ofthe rib 1li o 'verla ping the ad'acent end'oiil the bodyV or` tion o fthe stab. he ndjaeent edges" bfpt v siderably in burningandthe joints-aref-never flange 12 are beveled in op osite directions `from the beveled adjacent e ges of the body portion, in the manner clearly shown n Figure 7 The slabs are arranged overA the surface of a cylindrical form or core in the manner shown in Figure 4, said slabs being placed in the upper t\vothirds Y of said cylindrical surface, after which theconcrete body portion 18 of the sewer pipe may be cast into position .withthe concrete entering the dovetail ,grooves between thev edges of the ribs 11, thereby provid'- in means wherebythe liner. slabson blocks W51 be rigidly anchored'in position Within the ipe 18. y

T e joints between the edgesA of the slabs are painted.- with .ani acid-proof materi-ailf 19,

between. the., jacent edges., These joints, hoivvelvel',-` are not. alliwtaysv` perect, due. toi, the fact.-vitz'.ified-,tile or slabs usually wal-,pIconf WhichJiSmsuaIBlheavy enoughto form aYV seal perfect,.so therejsmlwaysa chance. for ases and thelike: to. enter betweenrthesla sat-v variouspoints.. Thegases-usual-ly:attacklthe concrete anddncompose it to `a .cer-tain' extent.

between tbe'Jinen andthe inner acefofithe sewer pipe.

It willhe .seen .that by oviding-,thedongitudinallribswith bevele ledges, I- have provided means wherebythe slabs orA blocks .wil-l beancbored': position evenl after.A considerable, amount of decomposition c of the f inner surface` oitheconcrete-.pipe has taken place.

It will. further. fbe seenV gthatf by beveling' theadjacent edges tof the vslabsinthe manner illustrated and deseribed.the side slabsof- .the lining.,will fassistin locking the top slabs in positions.

flanges 1.2 with.beveledri:bsf,-I.have also4 greatl E increasedthetendeney towardlocking-one sieb` .to the other., especially the abutting: ends' ofsaid, slabsfsethat .the whole diner` is locked together insuch azrnanner that it will be impossible towmovevany one of. the slabsfrom position within the .pipe without destroying the edgeso theabuttingslabs, even ifxthe innerzsurface of. the pipe 18 isdeoomposed to,

such! an' extent as :to heef. no, further' assistance in supportin the liner.

Inonder tov ro uce a more rapid construebu ming is. `taking.

s acedapant by means ofisidemembers 20, as

c early shnwnin Figure-'11, to. substantiallyorma hollow block.. Theianges' 12- extend inwardly.,- s'o that-.theouter' surface .of saidblocks:` will; .he .substantiallyrectangular and: be shipped. or, stacked conveniently,

my whereasif the dan e512 extendedoutwardly, nszher'etofore has. n the'praotice, the sind By providing,- the inner surface of the'- flanges would greatly hinder the stacking of the were and cause considerable damage due to breakage, The side members 20 are broken away when the slabs are placed in position, leaving a flat curved slab of the form clearly illustrated in Figures 2 and 3.

Another advanta e in forming these slabs in theA -form of a. ollow block having the anges extending inwardly, lies in the fact thntw-hen the side members 20 are broken 76 away, rouglrportions of the said side members remaiii'on the outer surface of the slab andleavesfthe surface of the slab perfectly smooth, to ermit free movement of the waterthrouglrftlhe pipe. In the drawings I haveillustrated slabs which are slightly curved.. It wilLbe'seen-that,flatxslabs might beprovidedfor-lningrectangular pipes or5 containers without departingfromitheospirit; of my inventitui...l

'Bhe-drawin f 'also illustrates; the; liners; coveringftxvo-t 'rdsxof the inner; surfacao the pipe;-. It is oftenfdesirable, however; to; cofven the entirezinnersurface othe 'peandz thisalso may be done-withoutdepartmgvfrom thfespirit'ofr'n. invention;-

Thusit will, 'eseen that I'have-providefh liner: slabs fornconcrete pipes which; areof.)v comparatively simple and cheap construction,l and which mayA be; easily andv quickly appliedz to the inner surafaceof lthe concrete pipe at; the timeoftheconstruction of the. pipe, and:- Which, .when-so: applied,l will greatly increasex the life. of-,theeoncrete pipe.

I 'claim :as my invention 1. A liner block comprising; a rectangularbody portionhavingits outersurface-provided withjlongitidinal Y ribs, and one end. profv vided'with-an offset flange,- the inner-surface of saidwflangc being-provided with ,.longitudi.- 10!` nal-ribs, thefsidefedges-of all of said; ribsbeing beveled inwardly.

2; A.liner-b1oc.k:comprisinga curved. rec-A tangnlarfbedy pertion having an oneienda. curved: oil'setiiange, the concave surface of 110 said flange bengprovided' with ribs extending lon -itudinallyl of said block,` the side edges-o .said-.ribsbeingbeveled inwardly.

3. A-,liner -bloek comprising a curved ree-- tangular. body portion having-at one endA an; lll` offset and curved angethe,oonoave surface of said flange being provided with ribs-ex.- tendingflongitudin l y oisaidbloek, the-side ed esof safidribshein beveledfinwandlyvthe' si ev edgesfo-saidfbo y portion being pro- 120 vided with-.at rabbet, the faoeofzsaid rabbeb that forms one edgefo-f the-main body portion being.beveledilmrardlyv 4. A liner block com rising a curved rec.- tangular .body portion airing.A at onefend' an 125 offset and curvedflan e, the convex surface. of the bod portion" .eingprovided: with longitudine, ribs terminating'insaid flange at one-end,- thesideedgesv of saidribabeing beveled inwardly, the concave surfaceosid 120 ange also being provided with ribs extending its outer side edge provided with a rabing longitudinally of said body portion havbet for receiving one edge of an adjacent ing their side edges beveled inwardly, Jthe block, substantially as described and for the "l spaces between the last said ribs being depurposes stated.

5 signed to receive the ends of the first said Des Moines, Iowa, June 17,1926.

ribs of an adjacent block, one edge of said body portion being provided with a rib hav- ROY M. DALLAM. 

